Kissing? Seriously, which humans looked at each other one day and said "lets mash our mouths together and swoosh our tounges around, that would be HOT".

What other normal things do YOU wonder who invented them and why.

Another example - who looked at a plant one day and said "Gee, i should smoke this. Im not sure why, but i bet it would be fun"..

Or also who looked at a cow and said " I should squeeze those things hanging down, and drink the milk that comes out of them. Bet it would be tasty"